Try this:
DoubleTree by Hilton Hotel Chicago Wood Dale - Elk Grove
1200 N. Mittel Blvd Wood Dale, Illinois 60191 USA
$140/night prepay. Just on the other side of the airport. It is twenty minutes to the convention center. Sign up for Hilton Honors, which is free, to get that rate.
It is just off of North Wood Dale Rd which runs right to E. Irving Park Rd (Rte 19). That road goes directly to North River Rd. just over a mile south of the convention center.
I would not park at the convention center or across the street. The Rosemont Subway station is about one-quarter of a mile up the road just past the Hyatt and Rte 190. I always park there and see a lot of other show attendees use it. Big difference in price and pretty hard to spend more than $7 parking.
Rosemont
5801 N. River Rd.
$7.00 for 0 to 14 hours
$9.00 for 14 to 18 hours
$13.00 for 18 to 24 hours
Each additional 24 hours (or fraction thereof) $13.00
Special multi-day discount rate available: $11/day for stays of 2 or more days, with an advance online reservation.
Here is where you can make parking reservations:
https://www.transitchicago.com/parking/. This is for those who do not want to pay for long term parking at the airport and will leave their car there. It is not really for part of a day.
You